Up-to-standard discharging system of slag-washing water from thermal power plant based on water balance

Abstract

The invention discloses an up-to-standard discharging system of slag-washing water from a thermal power plant based on water balance. The up-to-standard discharging system is provided with a slag washing pool, wherein the output of the slag-washing pool passes through a slag washing pump, a slag pool, a slag discharging pump, an ash yard, a clarifying pool, a softening device, a return-water coagulation and precipitation pool, a clean-water pool and a water return pump in sequence and then returns to the slag-washing pool; another path of the water return pump is directly connected with the water-producing end of a primary reverse-osmosis device, and the other path of the water return pump is connected with the input end of the primary reverse-osmosis device by a return-water filtering device and an ultrafiltration device; the concentrated-water end of the primary reverse-osmosis device is connected with a secondary reverse-osmosis device, the water-producing end of the secondary reverse-osmosis device is connected with the water-producing end of the primary reverse-osmosis device, and the concentrated-water end of the secondary reverse-osmosis device is connected with an evaporation and concentration device which exchanges heat with a steam system.

Description

technical field [0001] The invention relates to a thermal power plant slag water treatment system, in particular to a thermal power plant slag water discharge system based on water balance. Background technique [0002] my country is a country with a shortage of water resources, and the per capita water resources are less than a quarter of the world's average level. However, with the development of industry and agriculture, the pollution of water resources is becoming more and more serious, and the situation of water shortage is also becoming more and more prominent. At present, more than 70% of electricity supply is provided by coal-fired thermal power plants, and a large amount of water is needed in the production of thermal power generation. At present, the water used in the slag flushing process is basically waste water mixed with a large amount of impurities such as solid particles, salts and organic pollutants produced by thermal power plants. Due to the continuous g...

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Problems solved by technology

[0005] The invention successfully separates excessive and harmful inorganic salts from waste water of thermal power plants, removes various impurities in the water, solves the problem of impurity enrichment, and ensures that the water body indicators for flushing slag discharge meet national and local environmental protection requirements

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